Work Item
ASTM WK90779

Revision of A891/A891M-16(2021) Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels

Rationale

The Mn content is 0.50 % maximum. This was included in the original version possibly for a specific application. The reason is not evident to the SC. A638 Precipitation Iron Base Superalloy Bars, Forgings and Forging Stock for High Temperature Service has Mn at 2.00 max. So do AMS standards 5732, 5734 and 5737. This ballot is to align it with industry standards and what mills typically melt at since the lower Mn makes it a distinct chemistry that is more difficult to obtain as starting stock. The ballot is also intended to find the reason it was lowered by any objections.

Details

Developed by Subcommittee: A01.06

Committee: A01

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 05-15-2024

Technical Contact: Alex Monsour

Item: 000

Ballot:

Status: